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Mammoth Hot Springs, Yellowstone | by HansWobbe
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Mammoth Hot Springs, Yellowstone

Mammoth Hot Springs... is a large hill of travertine that has been created over thousands of years as hot water from the spring cooled and deposited calcium carbonate (over two tons flows into Mammoth each day in a solution...

 

more at WikiPedia:Mammoth Hot Springs

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Taken on September 8, 2009